by John Marshall Harlan, Chase v. United States (155 U.S. 489…
“ The general authority 'to establish postoffices' does not itself, or without more, necessarily imply authority to bind the United States by a contract to lease or purchase a postoffice building, although an appropriation of money to pay for the rent of a postoffice building at a named place might give authority to the postmaster general to lease such building in that locality as he deemed proper for the service, always keeping within the amount so appropriated. ”
